RC Concept R&D team has been tested numerous cells before choosing those high quality, low resistance ones. Those batteries allowall racers to have the maximum power and the maximum runtime in both their 2wd and 4wd vehicles.
All batteries are tested before shipping in order to have the best quality control.

The Omega Shorty 4500mAh has been used by Reno Savoya and Lorenzo Crolla for some 10mins mains on carpet racing.